Calendar Fixed Lots of slow SQL queries impacting user experience

Affected add-on version
2.4.0
Mouth

Mouth

The below is from my mysql-slow.log, an example of lots of Calendar queries taking 3-6 secs to complete. No other add-ons appearing in the slow log.
What can be done to improve these and have them stop taking so long?

Code: 
# Time: 2021-05-25T11:19:45.029564+10:00
# User@Host: netrider[netrider] @ localhost []  Id: 181002
# Schema: netrider  Last_errno: 0  Killed: 0
# Query_time: 3.153228  Lock_time: 0.000086  Rows_sent: 5  Rows_examined: 26690  Rows_affected: 0  Bytes_sent: 37164
SET timestamp=1621905585;
SELECT `xf_nf_calendar_event`.*, `xf_nf_calendar_calendar_Calendar_1`.*, `xf_user_User_2`.*, `xf_nf_calendar_event_response_UserResponse_3`.*, `xf_attachment_CoverImage_4`.*, `xf_attachment_data_Data_5`.*, `xf_permission_cache_content_Permissions_6`.*
                        FROM `xf_nf_calendar_event`
                        LEFT JOIN `xf_nf_calendar_calendar` AS `xf_nf_calendar_calendar_Calendar_1` ON (`xf_nf_calendar_calendar_Calendar_1`.`category_id` = `xf_nf_calendar_event`.`category_id`)
LEFT JOIN `xf_user` AS `xf_user_User_2` ON (`xf_user_User_2`.`user_id` = `xf_nf_calendar_event`.`user_id`)
LEFT JOIN `xf_nf_calendar_event_response` AS `xf_nf_calendar_event_response_UserResponse_3` ON (`xf_nf_calendar_event_response_UserResponse_3`.`user_id` = 0 AND `xf_nf_calendar_event_response_UserResponse_3`.`event_id` = `xf_nf_calendar_event`.`event_id`)
LEFT JOIN `xf_attachment` AS `xf_attachment_CoverImage_4` ON (`xf_attachment_CoverImage_4`.`content_type` = 'nf_calendar_event' AND `xf_attachment_CoverImage_4`.`content_id` = `xf_nf_calendar_event`.`event_id` AND `xf_attachment_CoverImage_4`.`attachment_id` = `xf_nf_calendar_event`.`cover_image_id`)
LEFT JOIN `xf_attachment_data` AS `xf_attachment_data_Data_5` ON (`xf_attachment_data_Data_5`.`data_id` = `xf_attachment_CoverImage_4`.`data_id`)
LEFT JOIN `xf_permission_cache_content` AS `xf_permission_cache_content_Permissions_6` ON (`xf_permission_cache_content_Permissions_6`.`content_type` = 'nf_calendar' AND `xf_permission_cache_content_Permissions_6`.`content_id` = `xf_nf_calendar_calendar_Calendar_1`.`category_id` AND `xf_permission_cache_content_Permissions_6`.`permission_combination_id` = '1')
                        WHERE (`xf_nf_calendar_event`.`event_state` = 'visible') AND (`xf_nf_calendar_event`.`category_id` = 5) AND (`xf_nf_calendar_event`.`event_id` <> 2577)
                        ORDER BY `xf_nf_calendar_event`.`last_update` DESC
                
LIMIT 5;
# Time: 2021-05-25T11:36:19.725921+10:00
# User@Host: netrider[netrider] @ localhost []  Id: 181400
# Schema: netrider  Last_errno: 0  Killed: 0
# Query_time: 5.393617  Lock_time: 0.000094  Rows_sent: 5  Rows_examined: 38814  Rows_affected: 0  Bytes_sent: 33505
SET timestamp=1621906579;
SELECT `xf_nf_calendar_event`.*, `xf_nf_calendar_calendar_Calendar_1`.*, `xf_user_User_2`.*, `xf_nf_calendar_event_response_UserResponse_3`.*, `xf_attachment_CoverImage_4`.*, `xf_attachment_data_Data_5`.*, `xf_permission_cache_content_Permissions_6`.*
                        FROM `xf_nf_calendar_event`
                        LEFT JOIN `xf_nf_calendar_calendar` AS `xf_nf_calendar_calendar_Calendar_1` ON (`xf_nf_calendar_calendar_Calendar_1`.`category_id` = `xf_nf_calendar_event`.`category_id`)
LEFT JOIN `xf_user` AS `xf_user_User_2` ON (`xf_user_User_2`.`user_id` = `xf_nf_calendar_event`.`user_id`)
LEFT JOIN `xf_nf_calendar_event_response` AS `xf_nf_calendar_event_response_UserResponse_3` ON (`xf_nf_calendar_event_response_UserResponse_3`.`user_id` = 0 AND `xf_nf_calendar_event_response_UserResponse_3`.`event_id` = `xf_nf_calendar_event`.`event_id`)
LEFT JOIN `xf_attachment` AS `xf_attachment_CoverImage_4` ON (`xf_attachment_CoverImage_4`.`content_type` = 'nf_calendar_event' AND `xf_attachment_CoverImage_4`.`content_id` = `xf_nf_calendar_event`.`event_id` AND `xf_attachment_CoverImage_4`.`attachment_id` = `xf_nf_calendar_event`.`cover_image_id`)
LEFT JOIN `xf_attachment_data` AS `xf_attachment_data_Data_5` ON (`xf_attachment_data_Data_5`.`data_id` = `xf_attachment_CoverImage_4`.`data_id`)
LEFT JOIN `xf_permission_cache_content` AS `xf_permission_cache_content_Permissions_6` ON (`xf_permission_cache_content_Permissions_6`.`content_type` = 'nf_calendar' AND `xf_permission_cache_content_Permissions_6`.`content_id` = `xf_nf_calendar_calendar_Calendar_1`.`category_id` AND `xf_permission_cache_content_Permissions_6`.`permission_combination_id` = '1')
                        WHERE (`xf_nf_calendar_event`.`event_state` = 'visible') AND (`xf_nf_calendar_event`.`category_id` = 2) AND (`xf_nf_calendar_event`.`event_id` <> 998)
                        ORDER BY `xf_nf_calendar_event`.`last_update` DESC
                
LIMIT 5;
# Time: 2021-05-25T11:36:26.583787+10:00
# User@Host: netrider[netrider] @ localhost []  Id: 181400
# Schema: netrider  Last_errno: 0  Killed: 0
# Query_time: 6.856547  Lock_time: 0.000098  Rows_sent: 5  Rows_examined: 50052  Rows_affected: 0  Bytes_sent: 28095
SET timestamp=1621906586;
SELECT `xf_nf_calendar_event`.*, `xf_nf_calendar_calendar_Calendar_1`.*, `xf_user_User_2`.*, `xf_nf_calendar_event_response_UserResponse_3`.*, `xf_attachment_CoverImage_4`.*, `xf_attachment_data_Data_5`.*, `xf_permission_cache_content_Permissions_6`.*
                        FROM `xf_nf_calendar_event`
                        LEFT JOIN `xf_nf_calendar_calendar` AS `xf_nf_calendar_calendar_Calendar_1` ON (`xf_nf_calendar_calendar_Calendar_1`.`category_id` = `xf_nf_calendar_event`.`category_id`)
LEFT JOIN `xf_user` AS `xf_user_User_2` ON (`xf_user_User_2`.`user_id` = `xf_nf_calendar_event`.`user_id`)
LEFT JOIN `xf_nf_calendar_event_response` AS `xf_nf_calendar_event_response_UserResponse_3` ON (`xf_nf_calendar_event_response_UserResponse_3`.`user_id` = 0 AND `xf_nf_calendar_event_response_UserResponse_3`.`event_id` = `xf_nf_calendar_event`.`event_id`)
LEFT JOIN `xf_attachment` AS `xf_attachment_CoverImage_4` ON (`xf_attachment_CoverImage_4`.`content_type` = 'nf_calendar_event' AND `xf_attachment_CoverImage_4`.`content_id` = `xf_nf_calendar_event`.`event_id` AND `xf_attachment_CoverImage_4`.`attachment_id` = `xf_nf_calendar_event`.`cover_image_id`)
LEFT JOIN `xf_attachment_data` AS `xf_attachment_data_Data_5` ON (`xf_attachment_data_Data_5`.`data_id` = `xf_attachment_CoverImage_4`.`data_id`)
LEFT JOIN `xf_permission_cache_content` AS `xf_permission_cache_content_Permissions_6` ON (`xf_permission_cache_content_Permissions_6`.`content_type` = 'nf_calendar' AND `xf_permission_cache_content_Permissions_6`.`content_id` = `xf_nf_calendar_calendar_Calendar_1`.`category_id` AND `xf_permission_cache_content_Permissions_6`.`permission_combination_id` = '1')
                        WHERE (`xf_nf_calendar_event`.`event_state` = 'visible') AND (`xf_nf_calendar_event`.`user_id` = 2) AND (`xf_nf_calendar_event`.`event_id` <> 998) AND (`xf_nf_calendar_event`.`event_id` NOT IN (3008, 3003, 2999, 2998, 2997))
                        ORDER BY `xf_nf_calendar_event`.`last_update` DESC
                
LIMIT 5;
 
Thanks. I've slimmed this down in the next version.

Specifically looks like it was attempting to join user responses to events when it shouldn't have been.
 
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